<template>
  <scroll ref="suggest"
          class="suggest"
          :data="result"
          :pullup="pullup"
          :beforeScroll="beforeScroll"
          @scrollToEnd="searchMore"
          @beforeScroll="listScroll"
  >
    <ul class="suggest-list">
      <li @click="selectItem(item)" class="suggest-item" v-for="(item,index) in result" :key="index">
        <div class="icon">
          <i :class="getIconCls(item)"></i>
        </div>
        <div class="name">
          <p class="text" v-html="getDisplayName(item)"></p>
        </div>
      </li>
      <loading v-show="hasMore" title=""></loading>
    </ul>
    <div v-show="!hasMore && !result.length" class="no-result-wrapper">
      <no-result title="抱歉，暂无搜索结果"></no-result>
    </div>
  </scroll>
</template>

<script type="text/ecmascript-6">
import Scroll from 'base/scroll/scroll'
import Loading from 'base/loading/loading'
import NoResult from 'base/no-result/no-result'
import { search } from 'api/search'
import { ERR_OK } from 'api/config'
import { createSong, isValidMusic, processSongsUrl } from 'common/js/song'
import { mapMutations, mapActions } from 'vuex'
import Singer from 'common/js/singer'
const TYPE_SINGER = 'singer'
const perpage = 20
export default {
  props: {
    showSinger: {
      type: Boolean,
      default: true
    },
    query: {
      type: String,
      default: ''
    }
  },
  data () {
    return {
      page: 1,
      pullup: true,
      beforeScroll: true,
      hasMore: true,
      result: []
    }
  },
  methods: {
    refresh () {
      this.$refs.suggest.refresh()
    },
    search () {
      this.page = 1
      this.hasMore = true
      this.$refs.suggest.scrollTo(0, 0)
      search(this.query, this.page, this.showSinger, perpage).then((res) => {
        if (res.code === ERR_OK) {
          this._genResult(res.data).then((result) => {
            this.result = result
          })
          this._checkMore(res.data)
        }
      })
    },
    searchMore () {
      if (!this.hasMore) {
        return
      }
      this.page++
      search(this.query, this.page, this.showSinger, perpage).then((res) => {
        if (res.code === ERR_OK) {
          this._genResult(res.data).then((result) => {
            this.result = this.result.concat(result)
          })
          this._checkMore(res.data)
        }
      })
    },
    listScroll () {
      this.$emit('listScroll')
    },
    selectItem (item) {
      if (item.type === TYPE_SINGER) {
        const singer = new Singer({
          id: item.singermid,
          name: item.singername
        })
        this.$router.push({
          path: `/search/${singer.id}`
        })
        this.setSinger(singer)
      } else {
        this.insertSong(item)
      }
      this.$emit('select', item)
    },
    getDisplayName (item) {
      if (item.type === TYPE_SINGER) {
        return item.singername
      } else {
        return `${item.name}-${item.singer}`
      }
    },
    getIconCls (item) {
      if (item.type === TYPE_SINGER) {
        return 'icon-mine'
      } else {
        return 'icon-music'
      }
    },
    _genResult (data) {
      let ret = []
      if (data.zhida && data.zhida.singerid && this.page === 1) {
        ret.push({ ...data.zhida, ...{ type: TYPE_SINGER } })
      }
      return processSongsUrl(this._normalizeSongs(data.song.list)).then((songs) => {
        ret = ret.concat(songs)
        return ret
      })
    },
    _normalizeSongs (list) {
      let ret = []
      list.forEach((musicData) => {
        if (isValidMusic(musicData)) {
          ret.push(createSong(musicData))
        }
      })
      return ret
    },
    _checkMore (data) {
      const song = data.song
      if (!song.list.length || (song.curnum + (song.curpage - 1) * perpage) >= song.totalnum) {
        this.hasMore = false
      }
    },
    ...mapMutations({
      setSinger: 'SET_SINGER'
    }),
    ...mapActions([
      'insertSong'
    ])
  },
  watch: {
    query (newQuery) {
      if (!newQuery) {
        return
      }
      this.search(newQuery)
    }
  },
  components: {
    Scroll,
    Loading,
    NoResult
  }
}
</script>

<style scoped lang="less">
  @import "~common/less/variable";
  @import "~common/less/mixin";
  .suggest{
    height: 100%;
    overflow: hidden;
    .suggest-list{
      padding: 0 30px;
      .suggest-item{
        display: flex;
        align-items: center;
        padding-bottom: 20px;
      }
      .icon{
        flex: 0 0 30px;
        width: 30px;
        [class^="icon-"]{
          font-size: 14px;
          color: @color-text-d;
        }
      }
      .name{
        flex: 1;
        font-size: @font-size-medium;
        color: @color-text-d;
        overflow: hidden;
        .text{
          .no-wrap();
        }
      }
    }
    .no-result-wrapper{
      position: absolute;
      width: 100%;
      top: 50%;
      transform: translateY(-50%);
    }
  }
</style>
